The holiness of God is not a common topic in most pulpits these days.  But if we are to truly understand the nature of God, we must understand this aspect of His character.  And if we are to truly live successful and fruitful lives as Christians, we absolutely must understand the holiness of God because He commands His children to be Holy because He is holy.  This aspect of God's character, in fact, is His most important attribute according to the Word of God.  Therefore, it falls on us to understand holiness in the fear of the Lord.